Internet explorer(IE) is a fine browser. It is not my first choice, I am more of a firefox fan myself. However, I always use IE when firefox is acting up...and I also end up using something like IEtab for when a site requires IE. (perhaps for activex support)

//yepnope.js is only 1.7kb
//Modernizr now includes yepnope.js and you can use their feature-detect for json if you've got it.
//https://raw.github.com/SlexAxton/yepnope.js/master/yepnope.js
// I am not suggesting you use unminified js, just pointing to the latest resources for your viewing pleasure.
yepnope({
test: window.JSON,
nope: 'https://raw.github.com/douglascrockford/JSON-js/master/json2.js',
complete: function () {
var data = window.JSON.parse('{ "json" : "string" }');
}
});